To explore the characteristics of flame spread over wood surface on plateau, a series of experiments were carried out in Lhasa (the plateau) and Hefei(the plain) , respectively. The pyrolysis temperature , flame temperature, combustion length and burning rate were measured and analyzed. Results show that the pyrolysis temperatures at both altitudes are almost the same, while the flame temperature on plateau is slightly higher than that on plain. The combustion length in Lhasa is shorter than that in Hefei, and both of them increase with sample width following the power laws. Similar to the prior study results, the burning rate on plateau is smaller. As sample width increases , the burning rates at both altitudes drop and their difference also decreases, which means that fire hazards on plateau get closer to those on plain within the scale range of this study.%在拉萨高原地区和合肥平原地区开展了一系列木材表面火蔓延对比实验研究，通过对火蔓延过程中一些重要特性参数(固相热解温度、气相火焰温度、燃烧区长度和燃烧速率等)的测量，分析了高原地区的火灾危害特性.结果表明，高原地区的固相热解温度与平原差别不大，但是气相火焰温度要略高一些.火蔓延过程中高原地区的燃烧区长度比平原的小，而且两地的燃烧区长度都随着试样宽度的增加而呈幂数增加的规律.高原地区的燃烧速率要更小一些，且两地的燃烧速率都随着试样宽度的增加而减小.但是两地燃烧速率之间的差异也随着试样宽度的增加而减小，这也意味着在本实验开展的尺寸范围内，随着火灾尺寸的增加，高原地区的火灾危害性和平原地区越来越接近.
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